Unable to Unlock External Hard Drive w/ Correct Password

Specs
Retina MacBook Pro
Mac OS 10.9.4
Encrypted External Hard Drive with Time Machine application
Issue
I’m not able to unlock my ext. hard drive with the password stored in Keychain Access or by manually entering the password. When I plug my ext. hard drive on another computer the password works just fine.
I also noticed that when unlocking the ext. hard drive with an incorrect password the window will shake. When I unlock using the correct password it'll stall for about 10 seconds before it shakes. I’m not sure if that’s an indication of anything.
I formatted the ext. hard drive and encrypted it again. It works fine for a little bit before the same issue crops up again and the same password no longer unlocks the external hard drive. Again, it’ll unlock just fine on another computer.
Steps I've done so far in attempt to resolve the issue:
Keychain First Aid
Reset My Default Keychain
Repaired Disk Permission
Unlocking via Disk Utility
Formatting the external hard drive
Help!
I’ve come to the conclusion that it must be related to Keychain Access, the OS, or something else on my computer that’s preventing me from unlocking it. Does anyone have any clue why this is happening and what I can do to repair the issue?

Hi Kevin,
Its "Mac OS Extended (Journaled, Encrypted)" and its partitioned
kind regards,
thanks

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